Synchronizing arrangement



June 29, 1943. G. wEGENl-:R 2,322,985

SYNCHRONI Z ING ARRANGEMENT Filed April 19', 1941 /m/enfor: Y

gwfzw Wyener Patented June 29, 1943 UNITED STATES PA'IENT-` OFFICE sans SYNCHBOIZING Gustav Wegener, Berlin, Germany; vested in the Alien `Property Custodian Appllcatill): April 19, 1941, Serial Nia-389,473

y ssrn 24. im c c 3 Cltlllll.` (Cl. 172-203) mitting side and the receiving side. Such time tappers are able to maintain a .synchronous and cophasal motion of `sender and receiver fora short period. Where the synchronous and c0- phasal rotation of a controlled shaft in the receiver is to be maintained during a longer time without requiring any manual readjustment, current impulses may be conveyed to the receiver in order to compensate for disturbances of sync chronism.

In many devic d this kind a control shaft of the receiveris given a small continuously acting advance by means of a local time tapper. The

control impulses arriving from the sender balance this advance and thereby insure synchronism and correct phaseconditions. As these control devices require thecontrolled shaft -to be either leading .orv lagging, the synchronism will motion of the control shaft but provides for compensating small leading or lagging motions of anyone of the two shafts and also does away with changesof rotation which the two shafts may undergo simultaneously. Changes of this kind may be due to the temperature of the time tapper varying or may be due tolother causes ena tailing small variations of the local synchronizing frequency. Y l l Whenever no control impulse arrives for any reason then in the novelarrangement the control device becomes inei'fective. Insuch case the synchronization of the controlled shaft is effected by the local synchronizingy device, the accuracy of synchronization in this event depending upon this local device until an impulse from the sender acts again to operate the control device provided by the invention.

The accompanying drawing is a circuit diagram showing one embodiment of the invention.

i denotes a driving machine synchronised by.

a local synchronizing device 2 which, for instance. may comprise a tuning fork or a quarts device and which in the case represented by way of vention does not provide for a leading or lagging example is an electron tube generator. Machine I serves to drive a shaft l whose rotation is to Jsynchrwonizethat of a shaft' l. shaft l thus forming part of the sender,.while shaft I forms part of the receiver. The shaft l is combined with an jimpulse sender 4 which at the end of each revolu-v e tion of shaft l acts to sendan impulse over a line Q or by wireless to the receiver. that is, the arrangement to be controlled. The controlled shaft l is driven by a machine I synchronized by a local synchronizing device f an impulse produced by the device' 4 is conveyed by brushes A, B of .a distributor I either to a segment I `or-a segment Il thereof and may happen to be of diil'erentlengths in relation to segment l, as will -be seen from the following statement according to which there are four possibilities of operation.

1. 'Ihe shafts l and l rotate synchronously and in phase-coincidence. vAs soon as the brush l B begins to sweep over the segment l the im` pulse from 4 is conveyed by a lcontact disc Il to a condenser K1 in order tobe stored here... The

condenser K1 then discharges over the grid leak resistance W1 of` an electron tube D1. During the discharge period of condenser K1 the tube D1 causes a polarized relay R1 to be switched as shown in the drawing and thereby to enable the desired automatic control action to take place. When brush B is about to leave the segment i the impulse is also conveyed through a'contact disc I! to a condenser Ka, disc I2 being somewhat offset with respect to disc Il. Condenser Ka. which is thus likewise charged, ldischarges over the gridleak resistance Wa of an electron tube Dz, whereby a polarized relay Rs brings its con-v tacts into the position likewise represented in the drawing. In consequence of the shafts I, I r0- tating synchronously and in phase coincidence l the impulse acts over segment l only. The segment jll is not acted upon by the impulse. A polarized relay Rs, associated with anl electron tube Da, a grid leak resistance W: and condenser Ks, hence is not caused to respond. The frequency effective in the synchronizing device l in order to synchronize the machine l is determined by capacities Ci, Cn, C: of device 1, namely,

those of these capacities which in their turn are determined with the aid of the'relays R1, Rzl Rs as far as these have been energized as described. In the present case therefore, in which the shafts I. rotate in synchronism and phase coincidence, the capacity effective in device 'I is C=C1+Cz.

2. With increasing speed of the shaft the impulse arises before the brush B reaches the segment i. As soon as brush B begins to sweep over the segment I the contact disc il again receives the impulse. The contact disc l2, however. does not receive it because the impulse has ceased when the disc I2 has assumed the position in which it is connected to segment 9. Relay Re consequently returns to normal. Relay rR: remains in its normal state since the impulse has not reached the segment I0. The capacity effective in the device 1 to determine the synchronizlng frequency therefore is C=Cz. It will be seen that the capacity is now smaller than in the case before. 'I'he synchronizing frequency is therefore higher, whereby the machine i runs quicker until condenser Ka is charged over segment i and contact disc I2.

3. If the rotation of shaft I becomes slower the control impulse is received by segment I0 and hence also actuates relay Ra. 'Ihe synchronizing frequency effective in device 1 is hence determined by the capacity C=C1+Cn+Ca. The frequency will thus be lower, that is to say. the machine I will run more slowly until no further impulse reaches the segment Il.

4. In case no impulse arrives from l the synchronizing frequency for machine 8 is determined by the capacity C=Ci+Cz since the relays Ri, Rx. Ra are not supplied with current and therefore remain in their state of rest. In such event the rotation of the shaft l is controlled by the synchronizing device 1 alone. It will be understood that polarized relays Ri and Ra are slightLv biased, by any suitable means, so that the tongues thereof return to their right hand contacts when the plate current of the associated tube drops below a predetermined level.

What is claimed is:

l. A synchronizing and phase correcting arrangement for printing telegraph circuits and the like comprising a transmitter having a rotary shaft, a receiver, a transmission line connecting said transmitter and receiver, a contact member associated with said transmitter arranged to transmit over said line with each revolution of said shaft a synchronizing and phasing impulse at a predetermined point in the shafts cycle. a rotary shaft at said receiver, means to drive said shafts at substantially the same speed, means at said receiver to compensate for relative speed variation of said shafts. comprising a brush secured to the receiver shaft, a distributor having a pair of segments cooperating with said brush` a pair of circuits extending from the first of said segments, a vacuum tube in each circuit, a relay connected in the output circuit of each of said vacuum tubes. a rotary member on said receiver shaft for closing said circuits in succession while said brush is passing over said first segment. means to operate said tubes and said relays by said impulse when substantially all of the latter is received while said brush is passing over said first segment. speed regulating means jointly controlled by said relays when operated for maintaining the speed of said shaft unchanged, means for operating but one of said relays when due to relative acceleration of the transmitter shaft only part of said impulse is received when said brush is passing over said first segment. means controlled by said relay to accelerate said receiver shaft, a circuit including a vacuum tube connected to the second of said segments, a third relay connected in the output circuit of said vacuum tube, means to operate the last mentioned tube and said third relay when due to a lag in the speed of said transmitter shaft in relation to said receiver shaft said synchronizing impulse is received on the second of said segments, and speed retarding means controlled by said third relay for adjusting the speed of said receiver shaft to correspond to that of the transmitter.

2. A synchronizing and phase correcting arrangement according to claim l in which the speed adjustment made by the joint'I operation of the first mentioned relays is the same as if no synchronizing impulse had been received.

3. A synchronizing and phase correcting arrangement according to claim l in which a grid leak and condenser is shunted across the input of each tube to maintain the tubes in operated condition for the duration of the condenser charge.

GUSTAV WEGENER. 

